On Fri, 2020-02-21 at 21:16 +0800, Yan, Zheng wrote:
> __ceph_caps_file_wanted() already checks 'caps_wanted_delay_min' and
> 'caps_wanted_delay_max'. There is no need to duplicte the logic in
> ceph_check_caps() and __send_cap()
>
> Signed-off-by: "Yan, Zheng" <zyan@xxxxxxxxxx>
> ---
> fs/ceph/caps.c | 146 ++++++++++++------------------------------------
> fs/ceph/file.c | 7 +--
> fs/ceph/inode.c | 1 -
> fs/ceph/super.h | 8 +--
> 4 files changed, 42 insertions(+), 120 deletions(-)
>
> diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
> index 2959e4c36a15..ad365cf870f6 100644
> --- a/fs/ceph/caps.c
> +++ b/fs/ceph/caps.c
> @@ -490,13 +490,10 @@ static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
> struct ceph_inode_info *ci)
> {
> struct ceph_mount_options *opt = mdsc->fsc->mount_options;
> -
> - ci->i_hold_caps_min = round_jiffies(jiffies +
> - opt->caps_wanted_delay_min * HZ);
> ci->i_hold_caps_max = round_jiffies(jiffies +
> opt->caps_wanted_delay_max * HZ);
> - dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
> - ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
> + dout("__cap_set_timeouts %p %lu\n", &ci->vfs_inode,
> + ci->i_hold_caps_max - jiffies);
> }
>
> /*
> @@ -508,8 +505,7 @@ static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
> * -> we take mdsc->cap_delay_lock
> */
> static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
> - struct ceph_inode_info *ci,
> - bool set_timeout)
> + struct ceph_inode_info *ci)
> {
> dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
> ci->i_ceph_flags, ci->i_hold_caps_max);
> @@ -520,8 +516,7 @@ static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
> goto no_change;
> list_del_init(&ci->i_cap_delay_list);
> }
> - if (set_timeout)
> - __cap_set_timeouts(mdsc, ci);
> + __cap_set_timeouts(mdsc, ci);
> list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
> no_change:
> spin_unlock(&mdsc->cap_delay_lock);
> @@ -719,7 +714,7 @@ void ceph_add_cap(struct inode *inode,
> dout(" issued %s, mds wanted %s, actual %s, queueing\n",
> ceph_cap_string(issued), ceph_cap_string(wanted),
> ceph_cap_string(actual_wanted));
> - __cap_delay_requeue(mdsc, ci, true);
> + __cap_delay_requeue(mdsc, ci);
> }
>
> if (flags & CEPH_CAP_FLAG_AUTH) {
> @@ -1304,7 +1299,6 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
> struct cap_msg_args arg;
> int held, revoking;
> int wake = 0;
> - int delayed = 0;
> int ret;
>
> held = cap->issued | cap->implemented;
> @@ -1317,28 +1311,7 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
> ceph_cap_string(revoking));
> BUG_ON((retain & CEPH_CAP_PIN) == 0);
>
> - arg.session = cap->session;
> -
> - /* don't release wanted unless we've waited a bit. */
> - if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
> - time_before(jiffies, ci->i_hold_caps_min)) {
> - dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
> - ceph_cap_string(cap->issued),
> - ceph_cap_string(cap->issued & retain),
> - ceph_cap_string(cap->mds_wanted),
> - ceph_cap_string(want));
> - want |= cap->mds_wanted;
> - retain |= cap->issued;
> - delayed = 1;
> - }
> - ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
> - if (want & ~cap->mds_wanted) {
> - /* user space may open/close single file frequently.
> - * This avoids droping mds_wanted immediately after
> - * requesting new mds_wanted.
> - */
> - __cap_set_timeouts(mdsc, ci);
> - }
> + ci->i_ceph_flags &= ~CEPH_I_FLUSH;
>
> cap->issued &= retain; /* drop bits we don't want */
> if (cap->implemented & ~cap->issued) {
> @@ -1353,6 +1326,7 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
> cap->implemented &= cap->issued | used;
> cap->mds_wanted = want;
>
> + arg.session = cap->session;
> arg.ino = ceph_vino(inode).ino;
> arg.cid = cap->cap_id;
> arg.follows = flushing ? ci->i_head_snapc->seq : 0;
> @@ -1413,14 +1387,19 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
>
> ret = send_cap_msg(&arg);
> if (ret < 0) {
> - dout("error sending cap msg, must requeue %p\n", inode);
> - delayed = 1;
> + pr_err("error sending cap msg, ino (%llx.%llx) "
> + "flushing %s tid %llu, requeue\n",
> + ceph_vinop(inode), ceph_cap_string(flushing),
> + flush_tid);
> + spin_lock(&ci->i_ceph_lock);
> + __cap_delay_requeue(mdsc, ci);
> + spin_unlock(&ci->i_ceph_lock);
> }
>
> if (wake)
> wake_up_all(&ci->i_cap_wq);
>
> - return delayed;
> + return ret;
> }
>
> static inline int __send_flush_snap(struct inode *inode,
> @@ -1684,7 +1663,7 @@ int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
> if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
> (mask & CEPH_CAP_FILE_BUFFER))
> dirty |= I_DIRTY_DATASYNC;
> - __cap_delay_requeue(mdsc, ci, true);
> + __cap_delay_requeue(mdsc, ci);
> return dirty;
> }
>
> @@ -1835,8 +1814,6 @@ bool __ceph_should_report_size(struct ceph_inode_info *ci)
> * versus held caps. Release, flush, ack revoked caps to mds as
> * appropriate.
> *
> - * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
> - * cap release further.
> * CHECK_CAPS_AUTHONLY - we should only check the auth cap
> * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
> * further delay.
> @@ -1855,17 +1832,10 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
> int mds = -1; /* keep track of how far we've gone through i_caps list
> to avoid an infinite loop on retry */
> struct rb_node *p;
> - int delayed = 0, sent = 0;
> - bool no_delay = flags & CHECK_CAPS_NODELAY;
> bool queue_invalidate = false;
> bool tried_invalidate = false;
>
> - /* if we are unmounting, flush any unused caps immediately. */
> - if (mdsc->stopping)
> - no_delay = true;
> -
> spin_lock(&ci->i_ceph_lock);
> -
> if (ci->i_ceph_flags & CEPH_I_FLUSH)
> flags |= CHECK_CAPS_FLUSH;
>
> @@ -1911,14 +1881,13 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
> }
>
> dout("check_caps %p file_want %s used %s dirty %s flushing %s"
> - " issued %s revoking %s retain %s %s%s%s\n", inode,
> + " issued %s revoking %s retain %s %s%s\n", inode,
> ceph_cap_string(file_wanted),
> ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
> ceph_cap_string(ci->i_flushing_caps),
> ceph_cap_string(issued), ceph_cap_string(revoking),
> ceph_cap_string(retain),
> (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
> - (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
> (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
>
> /*
> @@ -1926,7 +1895,7 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
> * have cached pages, but don't want them, then try to invalidate.
> * If we fail, it's because pages are locked.... try again later.
> */
> - if ((!no_delay || mdsc->stopping) &&
> + if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
> S_ISREG(inode->i_mode) &&
> !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
> inode->i_data.nrpages && /* have cached pages */
> @@ -2006,21 +1975,6 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
> if ((cap->issued & ~retain) == 0)
> continue; /* nope, all good */
>
> - if (no_delay)
> - goto ack;
> -
> - /* delay? */
> - if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
> - time_before(jiffies, ci->i_hold_caps_max)) {
> - dout(" delaying issued %s -> %s, wanted %s -> %s\n",
> - ceph_cap_string(cap->issued),
> - ceph_cap_string(cap->issued & retain),
> - ceph_cap_string(cap->mds_wanted),
> - ceph_cap_string(want));
> - delayed++;
> - continue;
> - }
> -
> ack:
> if (session && session != cap->session) {
> dout("oops, wrong session %p mutex\n", session);
> @@ -2081,24 +2035,18 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
> }
>
> mds = cap->mds; /* remember mds, so we don't repeat */
> - sent++;
>
> /* __send_cap drops i_ceph_lock */
> - delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, 0,
> - cap_used, want, retain, flushing,
> - flush_tid, oldest_flush_tid);
> + __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, 0, cap_used, want,
> + retain, flushing, flush_tid, oldest_flush_tid);
> goto retry; /* retake i_ceph_lock and restart our cap scan. */
> }
>
> - if (list_empty(&ci->i_cap_delay_list)) {
> - if (delayed) {
> - /* Reschedule delayed caps release if we delayed anything */
> - __cap_delay_requeue(mdsc, ci, false);
> - } else if ((file_wanted & ~CEPH_CAP_PIN) &&
> - !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
> - /* periodically re-calculate caps wanted by open files */
> - __cap_delay_requeue(mdsc, ci, true);
> - }
> + /* periodically re-calculate caps wanted by open files */
> + if (list_empty(&ci->i_cap_delay_list) &&
> + (file_wanted & ~CEPH_CAP_PIN) &&
> + !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
> + __cap_delay_requeue(mdsc, ci);
> }
>
> spin_unlock(&ci->i_ceph_lock);
> @@ -2128,7 +2076,6 @@ static int try_flush_caps(struct inode *inode, u64 *ptid)
> retry_locked:
> if (ci->i_dirty_caps && ci->i_auth_cap) {
> struct ceph_cap *cap = ci->i_auth_cap;
> - int delayed;
>
> if (session != cap->session) {
> spin_unlock(&ci->i_ceph_lock);
> @@ -2157,18 +2104,10 @@ static int try_flush_caps(struct inode *inode, u64 *ptid)
> &oldest_flush_tid);
>
> /* __send_cap drops i_ceph_lock */
> - delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
> - CEPH_CLIENT_CAPS_SYNC,
> - __ceph_caps_used(ci),
> - __ceph_caps_wanted(ci),
> - (cap->issued | cap->implemented),
> - flushing, flush_tid, oldest_flush_tid);
> -
> - if (delayed) {
> - spin_lock(&ci->i_ceph_lock);
> - __cap_delay_requeue(mdsc, ci, true);
> - spin_unlock(&ci->i_ceph_lock);
> - }
> + __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
> + __ceph_caps_used(ci), __ceph_caps_wanted(ci),
> + (cap->issued | cap->implemented),
> + flushing, flush_tid, oldest_flush_tid);
> } else {
> if (!list_empty(&ci->i_cap_flush_list)) {
> struct ceph_cap_flush *cf =
> @@ -2368,22 +2307,13 @@ static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
> if (cf->caps) {
> dout("kick_flushing_caps %p cap %p tid %llu %s\n",
> inode, cap, cf->tid, ceph_cap_string(cf->caps));
> - ci->i_ceph_flags |= CEPH_I_NODELAY;
> -
> - ret = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
> + __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
> (cf->tid < last_snap_flush ?
> CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
> __ceph_caps_used(ci),
> __ceph_caps_wanted(ci),
> (cap->issued | cap->implemented),
> cf->caps, cf->tid, oldest_flush_tid);
> - if (ret) {
> - pr_err("kick_flushing_caps: error sending "
> - "cap flush, ino (%llx.%llx) "
> - "tid %llu flushing %s\n",
> - ceph_vinop(inode), cf->tid,
> - ceph_cap_string(cf->caps));
> - }
> } else {
> struct ceph_cap_snap *capsnap =
> container_of(cf, struct ceph_cap_snap,
> @@ -3001,7 +2931,7 @@ void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
> dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
> last ? " last" : "", put ? " put" : "");
>
> - if (last && !flushsnaps)
> + if (last)
> ceph_check_caps(ci, 0, NULL);
> else if (flushsnaps)
> ceph_flush_snaps(ci, NULL);
> @@ -3419,10 +3349,10 @@ static void handle_cap_grant(struct inode *inode,
> wake_up_all(&ci->i_cap_wq);
>
> if (check_caps == 1)
> - ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
> + ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL,
> session);
> else if (check_caps == 2)
> - ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
> + ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session);
> else
> mutex_unlock(&session->s_mutex);
> }
> @@ -4097,7 +4027,6 @@ void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
> {
> struct inode *inode;
> struct ceph_inode_info *ci;
> - int flags = CHECK_CAPS_NODELAY;
>
> dout("check_delayed_caps\n");
> while (1) {
> @@ -4117,7 +4046,7 @@ void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
>
> if (inode) {
> dout("check_delayed_caps on %p\n", inode);
> - ceph_check_caps(ci, flags, NULL);
> + ceph_check_caps(ci, 0, NULL);
> /* avoid calling iput_final() in tick thread */
> ceph_async_iput(inode);
> }
> @@ -4142,7 +4071,7 @@ void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
> ihold(inode);
> dout("flush_dirty_caps %p\n", inode);
> spin_unlock(&mdsc->cap_dirty_lock);
> - ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
> + ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL);
> iput(inode);
> spin_lock(&mdsc->cap_dirty_lock);
> }
> @@ -4160,7 +4089,7 @@ void __ceph_touch_fmode(struct ceph_inode_info *ci,
> ci->i_last_wr = now;
> /* queue periodic check */
> if (fmode && list_empty(&ci->i_cap_delay_list))
> - __cap_delay_requeue(mdsc, ci, true);
> + __cap_delay_requeue(mdsc, ci);
> }
>
> void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
> @@ -4209,7 +4138,6 @@ int ceph_drop_caps_for_unlink(struct inode *inode)
> if (inode->i_nlink == 1) {
> drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
>
> - ci->i_ceph_flags |= CEPH_I_NODELAY;
> if (__ceph_caps_dirty(ci)) {
> struct ceph_mds_client *mdsc =
> ceph_inode_to_client(inode)->mdsc;
> @@ -4265,8 +4193,6 @@ int ceph_encode_inode_release(void **p, struct inode *inode,
> if (force || (cap->issued & drop)) {
> if (cap->issued & drop) {
> int wanted = __ceph_caps_wanted(ci);
> - if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
> - wanted |= cap->mds_wanted;
> dout("encode_inode_release %p cap %p "
> "%s -> %s, wanted %s -> %s\n", inode, cap,
> ceph_cap_string(cap->issued),
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index 84058d3c5685..1d76bdf1a1b9 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -1552,7 +1552,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (dirty)
> __mark_inode_dirty(inode, dirty);
> if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
> - ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL);
> + ceph_check_caps(ci, 0, NULL);
> }
>
> dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
> @@ -2129,12 +2129,11 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
>
> if (endoff > size) {
> int caps_flags = 0;
> -
> /* Let the MDS know about dst file size change */
> - if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
> - caps_flags |= CHECK_CAPS_NODELAY;
> if (ceph_inode_set_size(dst_inode, endoff))
> caps_flags |= CHECK_CAPS_AUTHONLY;
> + if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
> + caps_flags |= CHECK_CAPS_AUTHONLY;
Does ceph_quota_is_max_bytes_approaching have any side effects?
It looks like that call can be pretty expensive (including a possible
separate round trip to the MDS). If we don't need to call it for other
reasons, then we should probably do:
if (ceph_inode_set_size(dst_inode, dst_off) ||
ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
caps_flags |= CHECK_CAPS_AUTHONLY;
> if (caps_flags)
> ceph_check_caps(dst_ci, caps_flags, NULL);
> }
> diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
> index 0b0f503c84c3..5a8fa8a2d3cf 100644
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -471,7 +471,6 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
> ci->i_prealloc_cap_flush = NULL;
> INIT_LIST_HEAD(&ci->i_cap_flush_list);
> init_waitqueue_head(&ci->i_cap_wq);
> - ci->i_hold_caps_min = 0;
> ci->i_hold_caps_max = 0;
> INIT_LIST_HEAD(&ci->i_cap_delay_list);
> INIT_LIST_HEAD(&ci->i_cap_snaps);
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index d89478db8b24..e586cff3dfd5 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -170,9 +170,9 @@ struct ceph_cap {
> struct list_head caps_item;
> };
>
> -#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
> -#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
> -#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
> +#define CHECK_CAPS_AUTHONLY 1 /* only check auth cap */
> +#define CHECK_CAPS_FLUSH 2 /* flush any dirty caps */
> +#define CHECK_CAPS_NOINVAL 4 /* don't invalidate pagecache */
>
> struct ceph_cap_flush {
> u64 tid;
> @@ -352,7 +352,6 @@ struct ceph_inode_info {
> struct ceph_cap_flush *i_prealloc_cap_flush;
> struct list_head i_cap_flush_list;
> wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
> - unsigned long i_hold_caps_min; /* jiffies */
> unsigned long i_hold_caps_max; /* jiffies */
> struct list_head i_cap_delay_list; /* for delayed cap release to mds */
> struct ceph_cap_reservation i_cap_migration_resv;
> @@ -513,7 +512,6 @@ static inline struct inode *ceph_find_inode(struct super_block *sb,
> * Ceph inode.
> */
> #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */
> -#define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */
> #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */
> #define CEPH_I_POOL_PERM (1 << 3) /* pool rd/wr bits are valid */
> #define CEPH_I_POOL_RD (1 << 4) /* can read from pool */
--
Jeff Layton <jlayton@xxxxxxxxxx>
